初始化提交

backend/alembic/env.py

@@ -0,0 +1,65 @@
+"""Alembic 迁移环境。"""
+
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection, make_url
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+from alembic import context
+from app.core.config import settings
+from app.db.base import Base
+
+config = context.config
+config.set_main_option("sqlalchemy.url", settings.resolved_database_url)
+target_metadata = Base.metadata
+
+
+def ensure_sqlite_parent_dir() -> None:
+    url = make_url(settings.resolved_database_url)
+    if url.drivername.startswith("sqlite") and url.database:
+        settings.resolve_from_backend(url.database).parent.mkdir(parents=True, exist_ok=True)
+
+
+def run_migrations_offline() -> None:
+    ensure_sqlite_parent_dir()
+    context.configure(
+        url=settings.resolved_database_url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection: Connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    ensure_sqlite_parent_dir()
+    section = config.get_section(config.config_ini_section, {})
+    connectable = async_engine_from_config(
+        section,
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+def run_migrations_online() -> None:
+    import asyncio
+
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()